Sunsong 3401780 Power Steering Pressure Line Hose Assembly

Power Steering Pressure Line Hose for Classic Trucks

Sunsong 3401780 is a power steering pressure line hose assembly built for select Chevrolet, GMC, and Dodge applications from the mid-1970s to 1979. It is engineered for direct replacement service on vehicles such as the Chevrolet P20 and P30, GMC P1500 and P3500 motorhome chassis, and Dodge W-series trucks and Ramcharger models listed below.

Key Features

• Pressure hose assembly for power steering systems
• 5/8 in. male inverted flare end 1 fitting
• 11/16 in. male inverted flare end 2 fitting
• 26.8 in. overall length for listed applications
• CSM hose material for fluid and heat resistance
• Built to exceed original equipment performance standards
• High-grade steel tubing with zinc electroplating for corrosion resistance
• High-pressure tested before leaving the factory

Detailed Description

This Sunsong power steering pressure line hose assembly, part number 3401780, is made for direct-fit replacement on compatible Chevrolet, GMC, and Dodge steering systems. It is engineered to restore proper hydraulic pressure transfer in applications including 1975-1976 Chevrolet P30 Motor Home, 1976 Chevrolet P20 Motor Home, 1977-1979 Chevrolet P30 w/o Hydroboost, 1979 Chevrolet P20 w/o Hydroboost, 1979 GMC P1500 Motorhome, 1979 GMC P3500 Motorhome, and select 1975-1977 Dodge W100, W150, W200, W300, and 1977 Dodge Ramcharger listings without snow plow package. The 3401780 part number is also cross-referenced to Dayco 70933 and Gates 355170 for the same application.

Construction details include CSM hose material, male inverted flare fittings at both ends, and steel tubing with zinc coating to help resist rust and corrosion from humidity, road salt, water, and grime. Sunsong 3401780 is intended for buyers replacing a worn or leaking pressure line on older truck and motorhome steering systems where exact fit and dependable hydraulic performance matter.

Common Problems This Hose Can Help Solve

• Power steering fluid leaks from a cracked or deteriorated pressure line
• Loss of steering assist caused by pressure loss in the hydraulic circuit
• Corrosion-related hose failure on older Chevrolet, GMC, and Dodge chassis
• Hard steering or inconsistent steering response linked to a damaged line
• Noise or fluid seepage at worn flare connections

Installation Notes and Tips

Verify the vehicle’s steering configuration before ordering, since fitment excludes Hydroboost on certain Chevrolet applications and excludes snow plow package configurations on listed Dodge models. Confirm both fitting sizes, hose length, and end types against the original line before installation. Clean the mating surfaces and inspect related steering components for wear, contamination, or damage that could affect the new hose.

Quality Assurance

Each Sunsong 3401780 hose is pressure tested at the factory before shipment. The design uses corrosion-resistant tubing and exact-fit engineering to support trouble-free installation and reliable operation in the listed applications.